body{
}
.overlay{
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.top{
    height: 50px;
    background: linear-gradient(to right, rgb(35,163,255), rgb(119,47,153));
}
.top>span {
    margin-left: 15px;
    color: white;
    font-family: Arial,sans-serif;
    font-weight: 700;
    font-size: 25px;
    line-height: 50px;
}
#admin{
    color: white;
    font-size: 17px;
    width: 80px;
    height: 120px;
    float: right;
    margin-top: 15px;
    margin-right: 15px;
    cursor: pointer;
}
#admin>span{
    text-align: center;
    color: white;
    font-size: 17px;
}
#down_list{
    position: absolute;
    z-index: 2;
    box-shadow: 1px 1px 1px 1px black;
    border-radius: 5px;
    display: none;
    height: 80px;
    margin-top: 15px;
}
#down_list>div{
    width: 80px;
    padding-top: 10px;
    padding-bottom: 10px;
    text-align: center;
    font-size: 15px;
    color: black;
}
#left_box{
    float: left;
    width: 190px;
    height: 900px;
}
.title_box01{
    width: 190px;
    height: 40px;
    font-size: 15px;
    font-weight: 150;
    display: inline-block;
    align-items: center;
}
.title_box01>span{
    line-height: 40px;
    margin-left: 10px;
    cursor: pointer;
}
.title_box{
    width: 190px;
    height: 40px;
    font-size: 15px;
    font-weight: 150;
    display: inline-block;
    align-items: center;
}
.title_box:hover{
    background: linear-gradient(to right, rgb(35,163,255), rgb(119,47,153));
}
.title_box>span{
    line-height: 40px;
    margin-left: 10px;
    cursor: pointer;
}
.down_btn{
    float: right;
    cursor: pointer;
    margin-right: 20px;
}
#student,
#teacher,
#password_update_box
{
    display: none;
    cursor: pointer;
}
#task{
    position:absolute;
    left: 198px;
    top: 58px;
    z-index: 1;
    width: 1438px;
    height: 40px;
    float: left;
}
.task_box{
    font-weight: 150;
    padding-right: 10px;
    padding-left: 10px;
    line-height: 40px;
    font-size: 14px;
    float: left;
    height: 40px;
    width: auto;
}
#student_box,
#teacher_box{
    display: none;
}
#password_update{
    transform: translate(-50%,-50%);
    display: none;
    background-color: white;
    box-shadow: 0.5px 0.5px 1px 1px black;
    border-radius: 5px;
    height: 280px;
    width: 430px;
    position:absolute;
    left: 630px;
    top: 280px;
    z-index: 3;
}
#password_box{
    margin-left: 30px;
    margin-top: 50px;
}
#password_box_title_right{
    margin-left: 15px;
    font-size: 12px;
    font-weight: 150;
}
#password_box_title_left{
    padding-right: 10px;
    float: right;
}
#password_box_title_left>i{
    font-weight: 150;
    font-size: 12px;
    margin-left: 10px;
    cursor: pointer;
}
.password_input{
    width: 200px;
    height: 25px;
}
#password_box>p span{
    font-size: 14px;
    font-weight: 150;
    padding-right: 10px;
    text-align: right;
    display: inline-block;
    width: 80px;
}
.btn{
    border: 1px solid #36bb70;
    background-color: #36bb70;
    width: 100px;
    height: 30px;
    margin-top: 10px;
    margin-left: 75px;
}